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Helping Engineers Learn Mathematics Workbooks (HELM) Free college level workbooks. CC-Licensed.
Posted in Science, because it's math and physics.
Nothing wrong with free course materials.
https://www.democraticunderground.com/122893946
Workbooks here, but do read the intro I posted above.
https://nucinkis-lab.cc.ic.ac.uk/HELM/helm_workbooks.html
